That is a Pre-2005 Stainless Steel Weber Performer grill with gas-assist starter. $100 might be a little high, but not bad. You need to ask if the gas starter works, if the one-touch ash removal system is all there and in good shape. Those are repairable with parts from Weber, but will add cost. You may also need a new charcoal and/or cooking grate. The plastic rollers on the lid holder are missing for some reason.
Its hard to tell from the pics if the lid is really dirty or really scuffed up. If its just dirty some elbow grease should get it cleaned up nice. if those are scratches I personally would pass for that price.
I recently bought an '07 Performer in PERFECT condition for $85.